Portable digital audio player



FIG. 1 is a front view thereof;

FIG. 2 is a front view of FIG. 1, wherein the portable digital audio player is in an open position;

FIG. 3 is a right closed view thereof;

FIG. 4 is a right open view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for portable digital audio player, as shown and described. 